Scandium-doped zinc cadmium oxide as a new stable n-type oxide thermoelectric material

Abstract

Scandium-doped zinc cadmium oxide is proposed as a new n-type oxide thermoelectric material, which is stable in air at high temperature up to 1073 K, and having a 7-fold-reduced thermal conductivity at RT and the highest ZT ∼0.3 at 1173 K.

A self-forming nanocomposite concept for ZnO-based thermoelectrics

“…Another important issue is the long-term stability of ZnO-based thermoelectrics under elevated temperatures, known as one of the major concerns limiting the potential applications 13,14 . The effect of ageing in these materials is mostly linked to the deterioration of the electrical properties rather than the thermal conductivity, which may be even suppressed by the exsolution of the dopant cations from wurtzite lattice at the nanoscale level.…”

“…However, while being promising in terms of electrical properties, the high thermal conductivity of ZnO-based oxides represents a principal limiting factor for increasing the thermoelectric performance. The stability and reproducibility of the electrical properties also remain a significant challenge 13,14 , contributing to the large dispersion of the data reported in the literature.…”

Synergistic effects of zirconium- and aluminum co-doping on the thermoelectric performance of zinc oxide

“…For the latter, aluminum was selected as a second dopant, based on relatively well-studied thermoelectric properties and related effects in Zn(Al)O system. Particular attention was given to the assessment of the stability at high temperatures, where degradation of the electrical properties represents one of the main obstacles towards the potential application of ZnO-based thermoelectrics [27,28].…”

Enhanced thermoelectric performance of twisted bilayer graphene nanoribbons junction

“…Bandgap opening is shown following the twisting of the bilayer graphene, which results in an increase of the Seebeck coefficient [48]. As shown in Figure 5(d) shows the ZT values of four TBNGRJs, four peak ZT values are more than 1 for the 21.8 o and 38.2 o rotation angles at 300 K. Particularly, in the 21.8 o rotation angle, the maximum ZT is 6.1, which is higher than most reported ZT values at room temperature [10,[49][50][51]. From Figure 5, the peaks of ZT higher than 1 exist in 21.8 o and 38.2 o rotation angles.…”